Possible Clues:

• It takes travellers by road and rail
• The sheep can get into the cart and go by rail
• Always on line to get the sheep into the cart
• Electrically-powered public transport vehicle
• Start back from the market by rail with 20 down
• Rock roller?
• Electrically driven public transport vehicle
• Electric transport
• It became obsolete when the market backed the automobile
• Passenger vehicle running on rails